Write, compile and run React JS code directly in your browser. No installation, no setup — just pure React with live preview, real-time error detection and JSX support.
A powerful browser-based React IDE packed with developer-friendly features — zero configuration required.
Babel standalone converts your JSX to vanilla JavaScript instantly as you type. See output refresh in milliseconds without waiting for a build step.
Use all core hooks — useState, useEffect, useRef, useMemo, useCallback, useContext, useReducer — exactly as you would in a production app.
Syntax and runtime errors are caught and displayed immediately with clear, readable messages — so you can fix bugs without leaving the editor.
Jump-start with ready-to-run examples: Todo lists, counters, forms, API fetching, timers and context — ideal for learning or testing patterns quickly.
Export your React component as a .jsx file in one click, or copy it to clipboard to paste directly into your local project or IDE.
Code from anywhere — the editor adapts cleanly to phones and tablets with touch-friendly controls and readable font sizes, no horizontal scroll.
Edit code and watch your component render side by side in real time. Switch between editor-only, preview-only and split-screen modes effortlessly.
Synchronized line numbers make debugging easier. One-click code formatting keeps your JSX tidy and consistently indented, always.
From blank editor to running React app — without installing a single dependency.
Type or paste your React component code into the editor. JSX, hooks, and modern ES6+ syntax are all fully supported out of the box.
Hit the green Run button or press Ctrl+Enter. Babel transpiles your JSX, React renders the component, and the output appears instantly.
Your component renders in the preview pane. Errors show inline. Iterate, experiment and perfect your component — all inside the browser.
Download your finalized .jsx file or copy it to clipboard. Drop it straight into your Vite, Next.js or Create React App project.
A React JS online compiler is a browser-based development environment that lets you write, compile and execute React code without needing Node.js, npm or any local toolchain. It uses Babel — a widely adopted JavaScript transpiler — to convert JSX syntax and modern ES6+ features into browser-compatible JavaScript in real time, then injects the compiled output into a sandboxed iframe where React renders your component immediately.
Whether you are a beginner exploring React for the first time or an experienced developer who wants to prototype a component quickly, an online React interpreter removes every setup barrier. There is no create-react-app waiting period, no npm install, no Webpack configuration — just open the tool and start building.
Best practices for using this React JS editor include keeping each component focused and single-purpose, always declaring dependencies correctly in useEffect arrays, and preferring functional components with hooks over class-based ones. Use the built-in examples to study idiomatic patterns such as lifting state up, controlled inputs and conditional rendering before applying them in your projects.
Common use cases include learning React hooks interactively, running quick algorithm tests within a React UI, sharing reproducible bug reports, practising for coding interviews and demonstrating component behaviour in documentation. The tool supports useState, useEffect, useRef, useMemo, useCallback, useContext and useReducer — the full spectrum of core React hooks.
This free React code runner is compatible with React 18 and renders via ReactDOM.createRoot, matching the API you will encounter in real-world projects. Error boundaries and descriptive console messages help you understand exactly what went wrong and where, making it an invaluable learning and debugging companion.
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